Qt 4.8
Public Functions | Properties | List of all members
QPatternist::DynamicContextStore Class Reference

Evaluates its operand with an assigned DynamicContext, not the one passed to one of the evaluation functions. More...

#include <qdynamiccontextstore_p.h>

Inheritance diagram for QPatternist::DynamicContextStore:
QPatternist::SingleContainer QPatternist::Expression QSharedData QPatternist::CppCastingHelper< Expression > QPatternist::SourceLocationReflection

Public Functions

virtual ExpressionVisitorResult::Ptr accept (const ExpressionVisitor::Ptr &visitor) const
 
virtual const SourceLocationReflectionactualReflection () const
 Returns this. More...
 
 DynamicContextStore (const Expression::Ptr &operand, const DynamicContext::Ptr &context)
 
virtual bool evaluateEBV (const DynamicContext::Ptr &) const
 
virtual Item::Iterator::Ptr evaluateSequence (const DynamicContext::Ptr &) const
 
virtual Item evaluateSingleton (const DynamicContext::Ptr &) const
 
virtual SequenceType::List expectedOperandTypes () const
 
virtual SequenceType::Ptr staticType () const
 
- Public Functions inherited from QPatternist::SingleContainer
virtual bool compressOperands (const StaticContext::Ptr &)
 
virtual Expression::List operands () const
 
virtual void setOperands (const Expression::List &operands)
 
- Public Functions inherited from QPatternist::Expression
virtual void announceFocusType (const ItemType::Ptr &itemType)
 
virtual Expression::Ptr compress (const StaticContext::Ptr &context)
 
Properties deepProperties () const
 Computes the union of properties for this Expression and all its descending children. More...
 
virtual Properties dependencies () const
 
virtual QString description () const
 
virtual void evaluateToSequenceReceiver (const DynamicContext::Ptr &context) const
 
virtual ItemType::Ptr expectedContextItemType () const
 
 Expression ()
 
bool has (const Property prop) const
 
bool hasDependency (const Property prop) const
 
virtual ID id () const
 
bool is (const ID id) const
 
bool isEvaluated () const
 
virtual ItemType::Ptr newFocusType () const
 
virtual QList< QExplicitlySharedDataPointer< OptimizationPass > > optimizationPasses () const
 
virtual PatternPriority patternPriority () const
 
virtual Properties properties () const
 
const Expression::Ptrrewrite (const Expression::Ptr &to, const StaticContext::Ptr &context) const
 Rewrites this Expression to to, and return to. More...
 
virtual Expression::Ptr typeCheck (const StaticContext::Ptr &context, const SequenceType::Ptr &reqType)
 
virtual ~Expression ()
 
- Public Functions inherited from QSharedData
 QSharedData ()
 Constructs a QSharedData object with a reference count of 0. More...
 
 QSharedData (const QSharedData &)
 Constructs a QSharedData object with reference count 0. More...
 
- Public Functions inherited from QPatternist::CppCastingHelper< Expression >
const TCastTarget * as () const
 
TCastTarget * as ()
 
- Public Functions inherited from QPatternist::SourceLocationReflection
virtual QSourceLocation sourceLocation () const
 
 SourceLocationReflection ()
 
virtual ~SourceLocationReflection ()
 

Properties

DynamicContextm_context
 

Additional Inherited Members

- Public Types inherited from QPatternist::Expression
typedef QExplicitlySharedDataPointer< const ExpressionConstPtr
 A smart pointer wrapping const Expression instances. More...
 
enum  ID {
  IDBooleanValue = 1, IDCountFN, IDEmptyFN, IDExistsFN,
  IDExpressionSequence, IDGeneralComparison, IDIfThenClause, IDIgnorableExpression,
  IDIntegerValue, IDPositionFN, IDStringValue, IDValueComparison,
  IDRangeVariableReference, IDContextItem, IDUserFunctionCallsite, IDExpressionVariableReference,
  IDAttributeConstructor, IDUpperCaseFN, IDLowerCaseFN, IDFirstItemPredicate,
  IDEmptySequence, IDReturnOrderBy, IDLetClause, IDForClause,
  IDPath, IDNamespaceConstructor, IDArgumentReference, IDGenericPredicate,
  IDAxisStep, IDFloat, IDCombineNodes, IDUnresolvedVariableReference,
  IDCardinalityVerifier
}
 
typedef QList< Expression::PtrList
 
typedef QFlags< PropertyProperties
 
enum  Property {
  UseContextItem = 1, DisableElimination = 1 << 1, IsEvaluated = 1 << 2, DisableTypingDeduction = 1 << 3,
  EmptynessFollowsChild = 1 << 4, RewriteToEmptyOnEmpty = 1 << 5, RequiresFocus = 1 << 6, AffectsOrderOnly = 1 << 7,
  RequiresContextItem = (1 << 8) | RequiresFocus, CreatesFocusForLast = 1 << 9, LastOperandIsCollation = 1 << 10, DependsOnLocalVariable = (1 << 11) | DisableElimination,
  EvaluationCacheRedundant = (1 << 12), IsNodeConstructor = 1 << 13, RequiresCurrentItem = 1 << 14
}
 
typedef QExplicitlySharedDataPointer< ExpressionPtr
 A smart pointer wrapping mutable Expression instances. More...
 
typedef ::QAbstractXmlForwardIterator< Expression::PtrQAbstractXmlForwardIterator
 
typedef QVector< Expression::PtrVector
 
- Static Public Functions inherited from QPatternist::Expression
static void rewrite (Expression::Ptr &old, const Expression::Ptr &New, const StaticContext::Ptr &context)
 
- Public Variables inherited from QSharedData
QAtomicInt ref
 
- Protected Functions inherited from QPatternist::SingleContainer
 SingleContainer (const Expression::Ptr &operand)
 
- Protected Functions inherited from QPatternist::Expression
void typeCheckOperands (const StaticContext::Ptr &context)
 
- Protected Functions inherited from QPatternist::CppCastingHelper< Expression >
 CppCastingHelper ()
 
- Protected Variables inherited from QPatternist::SingleContainer
Expression::Ptr m_operand
 

Detailed Description

Evaluates its operand with an assigned DynamicContext, not the one passed to one of the evaluation functions.

Author
Frans Englich frans.nosp@m..eng.nosp@m.lich@.nosp@m.noki.nosp@m.a.com

Definition at line 70 of file qdynamiccontextstore_p.h.

Constructors and Destructors

◆ DynamicContextStore()

DynamicContextStore::DynamicContextStore ( const Expression::Ptr operand,
const DynamicContext::Ptr context 
)

Definition at line 52 of file qdynamiccontextstore.cpp.

53  : SingleContainer(operand),
54  m_context(context.data())
55 {
56  Q_ASSERT(context);
57 }
#define Q_ASSERT(cond)
Definition: qglobal.h:1823
SingleContainer(const Expression::Ptr &operand)
T * data() const
Returns a pointer to the shared data object.
Definition: qshareddata.h:145

Functions

◆ accept()

ExpressionVisitorResult::Ptr DynamicContextStore::accept ( const ExpressionVisitor::Ptr visitor) const
virtual

Implements QPatternist::Expression.

Definition at line 86 of file qdynamiccontextstore.cpp.

87 {
88  return visitor->visit(this);
89 }

◆ actualReflection()

const SourceLocationReflection * DynamicContextStore::actualReflection ( ) const
virtual

Returns this.

Reimplemented from QPatternist::Expression.

Definition at line 91 of file qdynamiccontextstore.cpp.

92 {
93  return m_operand->actualReflection();
94 }
virtual const SourceLocationReflection * actualReflection() const
Returns this.

◆ evaluateEBV()

bool DynamicContextStore::evaluateEBV ( const DynamicContext::Ptr context) const
virtual

Determines the Effective Boolean Value of the expression.

The Effective Boolean Value of a value is not necessarily the same as converting the value to a new value of type xs:boolean.

Note that this function cannot return the empty sequence, evaluateSingleton() must be overridden in order to be able to do that.

The default implementation results in a type error. Hence, this function must be overridden if such behavior is not of interest.

See also
XML Path Language (XPath) 2.0, 2.4.3 Effective Boolean Value

Reimplemented from QPatternist::Expression.

Definition at line 59 of file qdynamiccontextstore.cpp.

60 {
62 }
virtual bool evaluateEBV(const DynamicContext::Ptr &context) const

◆ evaluateSequence()

Item::Iterator::Ptr DynamicContextStore::evaluateSequence ( const DynamicContext::Ptr context) const
virtual

Evaluate this Expression by iterating over it. This is a central function for evaluating expressions.

Expressions must always always return a valid QAbstractXmlForwardIterator and may never return 0. If an empty result is of interest to be returned, the EmptyIterator should be returned.

The default implementation returns a SingletonIterator over the item returned from evaluateSingleton().

Note
This function may raise an exception when calling, not only when QAbstractXmlForwardIterator::next() is called on the return value. This is because in some cases evaluateSingleton() is called directly.

Reimplemented from QPatternist::Expression.

Definition at line 64 of file qdynamiccontextstore.cpp.

65 {
67 }
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const

◆ evaluateSingleton()

Item DynamicContextStore::evaluateSingleton ( const DynamicContext::Ptr context) const
virtual

Reimplemented from QPatternist::Expression.

Definition at line 69 of file qdynamiccontextstore.cpp.

◆ expectedOperandTypes()

SequenceType::List DynamicContextStore::expectedOperandTypes ( ) const
virtual

Returns a list of Sequence Types, describing the type of each of the expression's operands. Hence, this function has a relationship to the operands() function:

- The lengths of the lists returned by expectedOperandTypes()
and operands() should always be equal in length, since one
cannot describe the type of a non-existent operand(and all
operands must have type information).
- A significant difference between the two functions is that while
the type of objects in the list returned by operands() may vary
between compilations/static context, simply because the particular
Expression is part of different XPath expressions, the
types in the list returned by expectedOperandTypes is always the same
since the function/operator signature never changes.

This function should not be confused with staticType(), which returns the static type of the expression itself, not its operands. The function call is an expression where this is clear: the type of the return value is not the same as the arguments' types. The static type of the operands supplied to the expression can be determined via the staticType() function of the instances returned by operands().

If the expression has no operands, an empty list should be returned.

Implements QPatternist::Expression.

Definition at line 79 of file qdynamiccontextstore.cpp.

80 {
81  SequenceType::List result;
83  return result;
84 }
static const SequenceType::Ptr ZeroOrMoreItems
void append(const T &t)
Inserts value at the end of the list.
Definition: qlist.h:507
The QList class is a template class that provides lists.
Definition: qdatastream.h:62

◆ staticType()

SequenceType::Ptr DynamicContextStore::staticType ( ) const
virtual
Returns
the staticType() of its operand.

Implements QPatternist::Expression.

Definition at line 74 of file qdynamiccontextstore.cpp.

75 {
76  return m_operand->staticType();
77 }
virtual SequenceType::Ptr staticType() const =0

Properties

◆ m_context

DynamicContext* QPatternist::DynamicContextStore::m_context
private

Definition at line 89 of file qdynamiccontextstore_p.h.

Referenced by evaluateEBV(), evaluateSequence(), and evaluateSingleton().


The documentation for this class was generated from the following files: